| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.opennlp.ml.model; |
| |
| import java.io.BufferedReader; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileReader; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.util.StringTokenizer; |
| |
| import org.apache.opennlp.ml.maxent.GIS; |
| import org.apache.opennlp.ml.maxent.io.SuffixSensitiveGISModelWriter; |
| |
| /** |
| * Class for using a file of events as an event stream. The format of the file is one event perline with |
| * each line consisting of outcome followed by contexts (space delimited). |
| */ |
| public class FileEventStream extends AbstractEventStream { |
| |
| BufferedReader reader; |
| String line; |
| |
| /** |
| * Creates a new file event stream from the specified file name. |
| * @param fileName the name fo the file containing the events. |
| * @throws IOException When the specified file can not be read. |
| */ |
| public FileEventStream(String fileName, String encoding) throws IOException { |
| if (encoding == null) { |
| reader = new BufferedReader(new FileReader(fileName)); |
| } |
| else { |
| reader = new BufferedReader(new InputStreamReader(new FileInputStream(fileName),encoding)); |
| } |
| } |
| |
| public FileEventStream(String fileName) throws IOException { |
| this(fileName,null); |
| } |
| |
| /** |
| * Creates a new file event stream from the specified file. |
| * @param file the file containing the events. |
| * @throws IOException When the specified file can not be read. |
| */ |
| public FileEventStream(File file) throws IOException { |
| reader = new BufferedReader(new InputStreamReader(new FileInputStream(file),"UTF8")); |
| } |
| |
| public boolean hasNext() { |
| try { |
| return (null != (line = reader.readLine())); |
| } |
| catch (IOException e) { |
| System.err.println(e); |
| return (false); |
| } |
| } |
| |
| public Event next() { |
| StringTokenizer st = new StringTokenizer(line); |
| String outcome = st.nextToken(); |
| int count = st.countTokens(); |
| String[] context = new String[count]; |
| for (int ci = 0; ci < count; ci++) { |
| context[ci] = st.nextToken(); |
| } |
| return (new Event(outcome, context)); |
| } |
| |
| /** |
| * Generates a string representing the specified event. |
| * @param event The event for which a string representation is needed. |
| * @return A string representing the specified event. |
| */ |
| public static String toLine(Event event) { |
| StringBuilder sb = new StringBuilder(); |
| sb.append(event.getOutcome()); |
| String[] context = event.getContext(); |
| for (int ci=0,cl=context.length;ci<cl;ci++) { |
| sb.append(" ").append(context[ci]); |
| } |
| sb.append(System.getProperty("line.separator")); |
| return sb.toString(); |
| } |
| |
| /** |
| * Trains and writes a model based on the events in the specified event file. |
| * the name of the model created is based on the event file name. |
| * @param args eventfile [iterations cuttoff] |
| * @throws IOException when the eventfile can not be read or the model file can not be written. |
| */ |
| public static void main(String[] args) throws IOException { |
| if (args.length == 0) { |
| System.err.println("Usage: FileEventStream eventfile [iterations cutoff]"); |
| System.exit(1); |
| } |
| int ai=0; |
| String eventFile = args[ai++]; |
| EventStream es = new FileEventStream(eventFile); |
| int iterations = 100; |
| int cutoff = 5; |
| if (ai < args.length) { |
| iterations = Integer.parseInt(args[ai++]); |
| cutoff = Integer.parseInt(args[ai++]); |
| } |
| AbstractModel model = GIS.trainModel(es,iterations,cutoff); |
| new SuffixSensitiveGISModelWriter(model, new File(eventFile+".bin.gz")).persist(); |
| } |
| } |
| |